A U-Shaped Oscillatory Liquid Piston Compression Air Conditioner Driven by Rotary Displacer Stirling Engine

Lin, Chang-Sheng; Liu, Jui-Kai; Chiang, Hung-Tse

doi:10.3390/en13164091

Cited by 3 publications

(6 citation statements)

References 8 publications

(5 reference statements)

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“…Consequently, the change in hydrostatic pressure pushed to restore equilibrium conditions but the liquid overshot due to inertia. It comes into contact with the hot side having a temperature higher than the saturation temperature of the working fluid enhancing evaporation to initiate the pressure stage in the adiabatic vapor volume leading to a drop F I G U R E 1 1 Liquid piston air conditioner with a rotary displacer (Lin et al, 2020).…”

Section: Wet (2-phase)mentioning

confidence: 99%

“…Van de Ven et al, 2017). A liquid piston easily adapts to many configurations making designing extremely flexible (Lin et al, 2020). Long working cycle durations reduce requirements for quick response heat exchangers at the hot and cold sides of the displacer.…”

Section: Opportunitiesmentioning

confidence: 99%

“…The working gas temperature in the displacer chamber fluctuated between 50 C and 70 C while the condenser was between 25 C and 32 C. The energy efficiency of the system was about 5.5% providing cooling of about 2-3 C to a 2 L water bath with a COP between 1.3 and 1.5. (Lin et al, 2020) Trigeneration (Heating, Cooling, and Power) using solar energy…”

Section: Pumping With Electrical Resistance Heatersmentioning

confidence: 99%

“…In an experimental configuration (Lin et al, 2020), an extended rotary displacer was used to produce an enhanced cooling effect as in Figure 11.…”

Section: Wet (2-phase)mentioning

confidence: 99%

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Viability of low‐grade heat conversion using liquid piston Stirling engines

Mazhar,

Shen,

Liu

2024

WIREs Energy & Environment

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Liquid piston Stirling engines (LPSEs) are low‐cost, simple, maintenance‐free, and flexible external combustion engines with the potential to operate from low‐grade heat sources. This study reviews the major components, operations, and variants of LPSEs along with the mathematical models to assess their performance, which have been developed since the inception of LPSEs. Consequently, the technical feasibility of LPSEs in different applications is deduced from this complete systematic review, especially useful for both theoretical and applied researchers. The operation is based on a four‐stage Stirling cycle with most engines having three main components as per the findings of this study: the displacer columns, the regenerator, and tuning columns. The two main variants categorized by this study are the dry operating fluidyne and the wet operating thermofluidic. The accurate analyses of these engines are mostly within the spheres of experimental and numerical techniques since analytical mathematical models are difficult to develop owing to the complexity of the operating thermo‐physics. Pumping, cooling, and the direct generation of electricity are frequent applications of these engines reported in the literature. However, since their inception in 1969, these engines are yet to be commercialized owing to their low energy efficiency, power density, and reliability. The findings of this research conclude that LPSEs are essential for environment‐friendly pumping applications using low‐grade heat, especially in the irrigation sector of remote regions with limited access to electricity grids. Additionally, by replacing the electricity‐consuming status quo pumps, LPSEs ensure sustainability with minimal greenhouse gas emissions.This article is categorized under: Energy and Power Systems > Energy Management Sustainable Development > Energy‐Water‐Food Nexus Energy and Power Systems > Distributed Generation Sustainable Development > Goals

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Section: Wet (2-phase)mentioning

confidence: 99%

Section: Opportunitiesmentioning

confidence: 99%

Section: Pumping With Electrical Resistance Heatersmentioning

confidence: 99%

“…In an experimental configuration (Lin et al, 2020), an extended rotary displacer was used to produce an enhanced cooling effect as in Figure 11.…”

Section: Wet (2-phase)mentioning

confidence: 99%

See 2 more Smart Citations

Viability of low‐grade heat conversion using liquid piston Stirling engines

Mazhar,

Shen,

Liu

2024

WIREs Energy & Environment

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“…The liquid piston configuration of TDPs is interesting for rural area applications due to the potentials for low cost, local manufacturability, and maintenance requirements. Interesting applications of liquid piston concepts are also being investigated in other research areas as well (Kermani et al, 2020;Lin et al, 2020), as the replacements for solid-piston systems. Vapor plugs (bubbles) have also been considered as pistons to produce pumping effects using oscillatory heat pipes (Dobson, 2005).…”

Section: Literature Review: Thermally Driven Pumpsmentioning

confidence: 99%

Experimental investigation of a thermally driven pumping system for a potential application with a microgrid system for rural communities

Abirham

Mikšík²,

Thu³

et al. 2022

JTST

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Renewable energy-based microgrid systems are widely being studied as electrification methods for rural communities in developing countries. Waste heat generated by the components of the microgrid systems, such as the biogas driven generators (BDG), presents the potential of utilizing the low-grade heat in a way that can contribute to the sustainability of such energy systems. From the points of view of affordability, local manufacturability, and applicability for agriculture, thermally driven pumps (TDP) may be attractive for coupling with such microgrid systems. Therefore, the current study has focused on the development of a new type of thermally driven pumping system as a potential waste heat utilization component for microgrid applications in rural areas. A liquid piston-type TDP concept without moving parts, except few valves, was developed and parametric experimental investigations were carried out. The performance and characteristics of the system were studied, which revealed that the proposed system has a superior performance compared to the literature. It was also found that the system performance strongly depends on the heat addition rate and delivery capacity of the system, which are suitable characteristics for the intended application. Hence, the experimental data were used to estimate whether the proposed system can pump enough water that needs to be supplied for the biogas production to supply a 10 kW BDG unit of a microgrid. It was found that 87 -93% of the total pumped water (13 -27 m 3 ) would be available for agricultural and other purposes while only 6 -13% would need to be fed to the biogas digester. Generally, the results seem to be promising, and yet there are potentials for the optimization and improvement of the proposed system, hence they have been pointed out.

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Low temperature rotary Stirling engine: Conceptual design and theoretical analysis

Kropiwnicki

2024

Applied Thermal Engineering

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A U-Shaped Oscillatory Liquid Piston Compression Air Conditioner Driven by Rotary Displacer Stirling Engine

Cited by 3 publications

References 8 publications

Viability of low‐grade heat conversion using liquid piston Stirling engines

Viability of low‐grade heat conversion using liquid piston Stirling engines

Experimental investigation of a thermally driven pumping system for a potential application with a microgrid system for rural communities

Low temperature rotary Stirling engine: Conceptual design and theoretical analysis

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